App = {
    web3Provider: null,
    contracts: {},
  
    init: function() {
      // Load pets.
      $.getJSON('../pets.json', function(data) {
        var petsRow = $('#petsRow');
        var petTemplate = $('#petTemplate');
  
        for (i = 0; i < data.length; i ++) {
          petTemplate.find('.panel-title').text(data[i].name);
          petTemplate.find('img').attr('src', data[i].picture);
          petTemplate.find('.pet-breed').text(data[i].breed);
          petTemplate.find('.pet-age').text(data[i].age);
          petTemplate.find('.pet-location').text(data[i].location);
          petTemplate.find('.btn-adopt').attr('data-id', data[i].id);
  
          petsRow.append(petTemplate.html());
        }
      });
  
      return App.initWeb3();
    },
  
    initWeb3: function() {
  
      if (typeof web3 !== 'undefined') {
        App.web3Provider = web3.currentProvider;
      } else {
        App.web3Provider = new Web3.prviders.HttpProvider("http://127.0.0.1:7545");
      }
      web3 = new Web3(App.web3Provider);
  
      return App.initContract();
    },
  
    initContract: function() {
      $.getJSON('Adoption.json', function(data) {
        var AdoptionArtifact = data;
  
        App.contracts.Adoption = TruffleContract(AdoptionArtifact);
        App.contracts.Adoption.setProvider(App.web3Provider);
  
        return App.markAdopted();
      });
  
      return App.bindEvents();
    },
  
    bindEvents: function() {
      $(document).on('click', '.btn-adopt', App.handleAdopt);
    },
  
    markAdopted: function(adopters, account) {
      
      var apotionInstance;
      App.contracts.Adoption.deployed().then(function(instance) {
        apotionInstance = instance;
        return apotionInstance.getAdopters.call();
      }).then(function(adopters) {
        
        for(i =0; i< adopters.length; i++) {
          console.log(adopters[i]);
          if(adopters[i] !== '0x0000000000000000000000000000000000000000') {
            $('.panel-pet').eq(i).find('button').text('Success').attr('disabled', true);
          }
        }
      }).catch(function(err) {
        console.log(err.message);
      })
    },
  
    handleAdopt: function(event) {
      event.preventDefault();
      var apotionInstance;
      var petId = parseInt($(event.target).data('id'));
  
      web3.eth.getAccounts(function(error, accounts){
        var account = accounts[0];
  
        App.contracts.Adoption.deployed().then(function(instance){
          apotionInstance = instance;
  
          return apotionInstance.adopt(petId, {from: account});
        }).then(function(result) {
          return App.markAdopted();
        } ).catch(function(err) {
          console.log(err.message);
        });
      });
    }
  };
  
  $(function() {
    $(window).load(function() {
      App.init();
    });
  });
  